Bicycle Shift Control Device with Traveling State Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Novice riders face difficulty in understanding which shift lever to use for setting desired speed stages in bicycle transmissions, leading to unintended gear changes and discomfort due to increased or decreased pedaling resistance in both manual and automatic shift modes.
Innovation Solution
A bicycle shift control device featuring a traveling state detecting circuit and a manually operated switch that outputs a switch signal, allowing the shift control circuit to set the speed stage corresponding to the detected traveling state, enabling easy shifting with a single operation of the shift switch and selecting from multiple shift modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple manually operated levers are provided for front and rear derailleurs, then gear shifting capability is improved, but operation complexity increases making it difficult for novice riders
Solution Approach 1:
The patent combines control of both front and rear derailleurs into a single integrated shift control device with one lever and one button, eliminating the need for separate control devices for each derailleur. This merging reduces the number of components the rider must learn and operate, directly addressing the complexity issue while maintaining full gear shifting capability.
Solution Approach 2:
The single shift control device performs multiple functions: it controls both front and rear derailleurs, and supports both manual and automatic shifting modes. This multi-functionality allows one component to replace what would traditionally require multiple separate components, simplifying the interface for novice riders.
2Ease of operation
If automatic shift control is implemented, then ease of operation is improved, but unintended gear changes occur against rider intentions
Solution Approach 1:
The system dynamically switches between two operational modes: manual mode where the rider has full control over shifting decisions, and automatic mode where the microcomputer determines optimal gear changes based on riding conditions. This dynamic adaptability allows the system to prioritize either ease of operation or shifting accuracy depending on the selected mode, resolving the contradiction between automatic convenience and rider intention.
Solution Approach 2:
The automatic shifting mode uses feedback from sensors that detect riding conditions to determine when gear changes are appropriate, ensuring that automatic shifts align with actual riding needs rather than occurring arbitrarily. This feedback mechanism improves the reliability of automatic shifting by making it responsive to real-time conditions.
3Adaptability or versatility
If separate shift control devices are provided for front and rear derailleurs, then gear range coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges the control functions for both front and rear derailleurs into a single integrated device mounted on the handlebar. This single device includes one lever for manual shifting and one button for mode selection, eliminating the need for separate control devices while maintaining the ability to control both derailleurs independently when needed.
Solution Approach 2:
The unified shift control device performs multiple functions: it controls both front and rear derailleurs, supports manual and automatic modes, and provides a simplified interface. This multi-functional design reduces device complexity while preserving full gear range coverage capability.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A bicycle shift control device comprises a traveling state detecting circuit that detects a traveling state of the bicycle and a manually operated switch that outputs a switch signal. A shift control circuit provides a control signal, in response to the switch signal provided by the operation of the switch, for setting the speed stage of a bicycle transmission to correspond to the range of traveling states that contains the detected traveling state.